In this Feb. 6, 2013 photo, a Chinese tourist looks at a newly erected border fence in Dandong, China, opposite the North Korean border town of Sinuiju. China’s patience with North Korea is wearing thin, and a widely-expected nuclear weapons test by the latter could bring that frustration to a head. Beijing signaled its growing unhappiness by agreeing to tightened U.N. sanctions after North Korea launched a rocket in December, eliciting harsh criticism from Pyongyang and comment from China watchers surprised by Beijing’s unusually tough line. (AP Photo/Eugene Hoshiko)